How to delete 404 site crawler issues for pages that no longer exist

https://preview.webflow.com/preview/officeaccord?utm_medium=preview_link&utm_source=designer&utm_content=officeaccord&preview=60b64e828d9651fe3a9d6b32dfa3db45&workflow=preview

According to Moz.com we have 3 critical site crawler issues on our website. They were deleted a while ago thus we can not locate them to take action so are a bit lost as to what to do. Any idea on what we need to do? Thanks for any help you can provide.